Re: [PATCH iproute2] iproute: build more easily on Android

[Stephen Hemminger <stephen@networkplumber.org>]

On Tue,  3 Oct 2017 02:03:37 +0900
Lorenzo Colitti <lorenzo@google.com> wrote:

> iproute2 contains a bunch of kernel headers, including uapi ones.
> Android's libc uses uapi headers almost directly, and uses a
> script to fix kernel types that don't match what userspace
> expects.
> 
> For example: https://issuetracker.google.com/36987220 reports
> that our struct ip_mreq_source contains "__be32 imr_multiaddr"
> rather than "struct in_addr imr_multiaddr". The script addresses
> this by replacing the uapi struct definition with a #include
> <bits/ip_mreq.h> which contains the traditional userspace
> definition.
> 
> Unfortunately, when we compile iproute2, this definition
> conflicts with the one in iproute2's linux/in.h.
> 
> Historically we've just solved this problem by running "git rm"
> on all the iproute2 include/linux headers that break Android's
> libc.  However, deleting the files in this way makes it harder to
> keep up with upstream, because every upstream change to
> an include file causes a merge conflict with the delete.
> 
> This patch fixes the problem by moving the iproute2 linux headers
> from include/linux to include/uapi/linux.
> 
> Tested: compiles on ubuntu trusty (glibc)
> 
> Signed-off-by: Elliott Hughes <enh@google.com>
> Signed-off-by: Lorenzo Colitti <lorenzo@google.com>

Rather than moving everything, why not make kernel headers directory
configurable as part of the configure script setup process.